Submit FS#12218. Add support for embedded album art for ASF tags. For now the support is limited to embedded pictures of max 64 KB size.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30263 a1c6a512-1295-4272-9138-f99709370657

apps/metadata/asf.c

@@ -462,6 +462,53 @@ static int asf_parse_header(int fd, struct mp3entry* id3,
                         } else if (!strcmp("MusicBrainz/Track Id", utf8buf)) {
                             id3->mb_track_id = id3buf;
                             asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+#ifdef HAVE_ALBUMART
+                        } else if (!strcmp("WM/Picture", utf8buf)) {
+                            uint32_t datalength, strlength;
+                            /* Expected is either "01 00 xx xx 03 yy yy yy yy" or
+                             * "03 yy yy yy yy". xx is the size of the WM/Picture 
+                             * container in bytes. yy equals the raw data length of 
+                             * the embedded image. */
+                            lseek(fd, -4, SEEK_CUR);
+                            read(fd, &type, 1);
+                            if (type == 1) {
+                                lseek(fd, 3, SEEK_CUR);
+                                read(fd, &type, 1);
+                                /* In case the parsing will fail in the next step we 
+                                 * might at least be able to skip the whole section. */
+                                datalength = length - 1;
+                            }
+                            if (type == 3) {
+                                /* Read the raw data length of the embedded image. */
+                                read_uint32le(fd, &datalength);
+                            
+                                /* Reset utf8 buffer */
+                                utf8 = utf8buf;
+                                utf8length = 512;
+
+                                /* Gather the album art format, this string has a
+                                 * double zero-termination. */
+                                asf_utf16LEdecode(fd, 32, &utf8, &utf8length);
+                                strlength = (strlen(utf8buf) + 2) * 2;
+                                lseek(fd, strlength-32, SEEK_CUR);
+                                if (!strcmp("image/jpeg", utf8buf)) {
+                                    id3->albumart.type = AA_TYPE_JPG;
+                                } else if (!strcmp("image/png", utf8buf)) {
+                                    id3->albumart.type = AA_TYPE_PNG;
+                                } else {
+                                    id3->albumart.type = AA_TYPE_UNKNOWN;
+                                }
+
+                                /* Set the album art size and position. */
+                                if (id3->albumart.type != AA_TYPE_UNKNOWN) {
+                                    id3->albumart.pos  = lseek(fd, 0, SEEK_CUR);
+                                    id3->albumart.size = datalength;
+                                    id3->embed_albumart = true;
+                                }
+                            }
+                            
+                            lseek(fd, datalength, SEEK_CUR);
+#endif
                         } else {
                             lseek(fd, length, SEEK_CUR);
                         }

manual/appendix/file_formats.tex

@@ -295,7 +295,7 @@
     {\textbf{Feature} & \textbf{ID3} & \textbf{APE} & \textbf{Vorbis} & 
      \textbf{MP4} & \textbf{ASF}}{}{}
      Embedded albumart \fname{.bmp}     &   &   &   &   &   \\
-     Embedded albumart \fname{.jpg}     & x & x &   & x &   \\
+     Embedded albumart \fname{.jpg}     & x & x &   & x & x \\
      Embedded albumart \fname{.png}     &   &   &   &   &   \\
      Replaygain information             & x & x & x & x & x \\
      Title (string)                     & x & x & x & x & x \\
@@ -311,6 +311,8 @@
      Grouping (string)                  &   & x & x & x &   \\
     \end{rbtabular}
     
+    \note{Embedded album art for ASF is limited to pictures of maximum 64 KB size.}
+    
     \subsection{Featureset for codec specific metadata}
     \begin{rbtabular}{\textwidth}{lX}%
     {\textbf{Feature} & \textbf{Codec specific metadata (file extension)}}{}{}